Quick test method and device for quick charge adapter of mobile phone

Abstract

The invention relates to the technical field of mobile phone adapter testing, in particular to a rapid testing method and device for a mobile phone rapid charging adapter, and the method comprises the steps: determining a current difference index of a current signal; and determining the self-adaptive cut-off frequency of the current signal according to the dispersion degree of all current values of the current signal in each charging stage, the current difference index, the change condition of all current values of the current signal in each charging stage, and the distribution condition of the frequency of the current signal. Therefore, the output current of the mobile phone fast charging adapter can be detected. According to the application, the adaptive cut-off frequency of the current signal is obtained by analyzing the load change and the electromagnetic interference intensity generated by the mobile phone fast charging adapter, so that the low-pass filter can adaptively adjust the filtering intensity to obtain accurate current data, and the test accuracy of the mobile phone fast charging adapter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of mobile phone adapter testing, and in particular to a method and device for quickly testing a mobile phone fast charging adapter. Background Art

[0002] Mobile phone fast charging technology is an important technology that has developed in recent years with the improvement of smartphone performance and the growth of user demand. With the increase in mobile phone battery capacity and the increase in user demand for fast charging, traditional charging methods can no longer meet the needs of modern fast-paced life. Fast charging adapters can charge more power into mobile phone batteries in a shorter time by increasing voltage or current, thereby greatly shortening the charging time. With the popularization of fast charging technology, many different brands and models of fast charging adapters have appeared on the market, and their performance and safety vary.

[0003] Therefore, developing a fast testing method and device for mobile phone fast charging adapters is of great practical significance for ensuring the performance and safety of fast charging adapters and improving the user experience. In the testing process of mobile phone fast charging adapters, electromagnetic interference is a common problem, which can lead to inaccurate test data. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a method and device for quickly testing a mobile phone fast charging adapter. The technical solutions adopted are as follows: In a first aspect, an embodiment of the present application provides a method for quickly testing a mobile phone fast charging adapter, the method comprising the following steps: Collect the current signal of the mobile phone fast charging adapter during the overall charging process within the sampling time, wherein the overall charging process includes multiple charging stages; Determine a first current variation coefficient of the current signal according to the difference between all current values ​​in the current signal and their average distribution, combined with the degree of dispersion of all current values ​​of the current signal in each charging stage; Determining a second current variation coefficient of the current signal based on the variation of all current values ​​of the current signal in each charging stage; Based on the distribution of all frequencies of the current signal in the frequency domain, the adaptive cutoff frequency of the current signal is determined in combination with the first current change coefficient and the second current change coefficient to detect the output current of the mobile phone fast charging adapter.

[0005] Preferably, the method for determining the first current variation coefficient of the current signal is: Determine a current difference index of the current signal according to the difference between all current values ​​in the current signal and their average distribution; Analyze the mean of the discrete degrees of the current signal in all charging stages, and record it as the first mean of the current signal; A first current variation coefficient of the current signal is determined based on the first mean value and the current difference index.

[0006] Preferably, the method for determining the current difference index of the current signal is: Each current value in the current signal that is greater than the current value at the adjacent sampling moments before and after is recorded as the impact peak value of the current signal; Based on the difference between all impact peak values ​​of the current signal in each charging stage and the average distribution of all current values ​​in the corresponding charging stage, a current difference index of the current signal is determined.

[0007] Preferably, determining the current difference index of the current signal based on the difference between all impact peak values ​​of the current signal in each charging stage and the average distribution of all current values ​​in the corresponding charging stage further includes: Analyze the cumulative difference between all impact peak values ​​of the current signal in each charging stage and the average value of all current values ​​in the charging stage, and record it as the first current index of the current signal in each charging stage; The current difference index of the current signal is a result of integrating the first current indexes of the current signal in all charging stages.

[0008] Preferably, the first current variation coefficient of the current signal is the product of the first mean value of the current signal and the current difference index.

[0009] Preferably, the expression of the second current variation coefficient of the current signal is: ; The second current variation coefficient of the current signal; the entire charging process includes pre-charging, constant current charging and constant voltage charging stages, , They represent the current change rate in the pre-charging stage and the current change rate in the constant voltage charging stage respectively; Indicates the switching frequency of the mobile phone fast charging adapter.

[0010] Preferably, the method for determining the adaptive cutoff frequency of the current signal is: Analyze the normalized result of the sum of the first current variation coefficient and the second current variation coefficient of the current signal, and record it as the adjustment factor of the current signal; The frequency corresponding to the minimum current value after the third quartile of all current values ​​of the current signal sorted from small to large is recorded as the starting frequency of the current signal; An adaptive cutoff frequency of the current signal is determined based on the start frequency of the current signal and the adjustment factor.

[0011] Preferably, the adaptive cut-off frequency of the current signal is the product of the starting frequency of the current signal and the adjustment factor.

[0012] Preferably, the detecting the output current of the mobile phone fast charging adapter includes: The current signal and its adaptive cut-off frequency are used as the input of the low-pass filter, and the current signal with electromagnetic interference eliminated is output; If the average value of all current values ​​of the current signal for eliminating electromagnetic interference in the constant current charging stage is within a preset range, the output current of the mobile phone fast charging adapter to be tested is qualified, otherwise it is unqualified.

[0013] In a second aspect, an embodiment of the present application also provides a quick testing device for a mobile phone fast charging adapter, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above-mentioned quick testing methods for a mobile phone fast charging adapter when executing the computer program.

[0014] This application has at least the following beneficial effects: The present application determines a first current variation coefficient of the current signal based on the difference between all current values ​​in the current signal and its average distribution, combined with the degree of discreteness of all current values ​​of the current signal in each charging stage, so as to more accurately evaluate and describe the impact of load changes on the electromagnetic interference intensity during the charging process, thereby filtering out the impact of electromagnetic interference caused by load changes on the mobile phone fast charging adapter test; determines a second current variation coefficient of the current signal based on the change of all current values ​​of the current signal in each charging stage, so as to accurately quantify the electromagnetic interference caused by the internal switching elements of the mobile phone fast charging adapter in the pre-charging stage and the constant voltage charging stage, thereby filtering out the impact of electromagnetic interference caused by the internal components of the mobile phone fast charging adapter on the mobile phone fast charging adapter test; determines an adaptive cutoff frequency of the current signal based on the distribution of the current signal frequency, combined with the first current variation coefficient and the second current variation coefficient; filters the current signal based on the adaptive cutoff frequency to obtain a detection result.

[0015] This application obtains the adaptive cutoff frequency of the current signal by analyzing the load changes and the electromagnetic interference intensity generated by the mobile phone fast charging adapter itself. It can adjust the filtering intensity according to the electromagnetic interference conditions under different test conditions to obtain accurate current data, thereby improving the test accuracy of the mobile phone fast charging adapter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A flowchart of the steps of a quick testing method for a mobile phone fast charging adapter provided in this application; Figure 2 A schematic diagram of the adaptive cutoff frequency extraction process provided by this application; Figure 3 Schematic diagram of the output current detection process of the mobile phone fast charging adapter provided in this application. DETAILED DESCRIPTION

[0018] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation method, structure, features and effects of a mobile phone fast charging adapter quick testing method and device proposed in the present application in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0019] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0020] The specific scheme of a quick testing method and device for a mobile phone fast charging adapter provided by the present application is described in detail below with reference to the accompanying drawings.

[0021] See also Figure 1 , which shows a flowchart of a method for quickly testing a mobile phone fast charging adapter provided by an embodiment of the present application, the method comprising the following steps: Step S1: collecting the current signal of the mobile phone fast charging adapter during the test and performing preprocessing.

[0022] Connect the mobile phone fast charging adapter to be tested to the power supply and mobile phone respectively, simulate the charging scenario in actual use, and use the magnetoelectric current sensor to collect the current signal during the entire charging process. The sampling time is the time it takes for the mobile phone to charge from 10% to 100%, and the sampling frequency is the preset value. Perform baseline correction on the collected current signal to avoid systematic deviation.

[0023] It should be noted that the value of the sampling frequency, that is, the value of the preset value, is set manually. In this embodiment, the preset value is 1 kHz. The implementer can also set it according to the specific situation. This embodiment does not impose any special restrictions.

[0024] The baseline correction is a well-known technology, and the specific process of the correction will not be described in detail.

[0025] Step S2: determining a current difference index of the current signal according to the difference between all current values ​​in the current signal and their average distribution.

[0026] During the test, electromagnetic interference will have a significant impact on the current signal. Electromagnetic interference refers to the electromagnetic field generated by the rapid changes in current during the operation of electrical or electronic equipment. These electromagnetic fields may have adverse effects on other equipment or signal transmission.

[0027] The mobile phone fast charging adapter should ensure stable output current and make timely adjustments if unexpected current changes occur. However, in actual use, as the battery level of the mobile phone changes, the equivalent internal resistance of the mobile phone changes accordingly, and the change between the two is nonlinear, resulting in a nonlinear load on the mobile phone fast charging adapter. This will generate harmonics on the power line and form electromagnetic interference. This situation should be simulated during the test. The magnitude of the electromagnetic interference can be characterized by the current change.

[0028] When using a mobile phone fast charging adapter, when its equivalent internal resistance increases, the output current of the charger needs to be increased in order for the charger to provide enough current to charge the mobile phone. However, in order to avoid possible damage to the battery due to excessive output current, the mobile phone fast charging adapter will automatically adjust to reduce the output current to ensure that it does not exceed the rated current. This process will cause an impact peak in the current signal. Therefore, based on the difference between all current values ​​in the current signal and its average distribution, the current difference index of the current signal is calculated, specifically: The current value at each sampling moment in the current signal is compared with the current values ​​at the adjacent sampling moments before and after it, and the current value that is greater than the current value at the adjacent sampling moments before and after it is recorded as the impact peak value of the current signal.

[0029] Analyze the cumulative difference between all impact peak values ​​of the current signal in each charging stage and the average value of all current values ​​in the charging stage, and record it as the first current index of the current signal in each charging stage; The current difference index of the current signal is a result of integrating the first current indexes of the current signal in all charging stages.

[0030] It should be understood that fusion refers to combining two or more indicators by adding or multiplying them together in order to obtain a comprehensive indicator, thereby more comprehensively and accurately evaluating a phenomenon or problem. This fusion method is not limited to simple arithmetic operations, but can also include more complex statistical models and analysis methods. The implementer can choose according to the specific situation, and this embodiment does not impose any special restrictions.

[0031] Preferably, the impact factor of the current signal in this embodiment is the cumulative sum of the first current exponents of the current signal in all charging stages; in actual application, as other embodiments, the implementer may also use an exponential function value with a natural constant as the base and the cumulative result of the first current exponents of the current signal in all charging stages as the independent variable as the impact factor of the current signal.

[0032] The current difference index represents the cumulative result of the current shock caused by the use of mobile phones during the charging process. The larger the value of the current difference index, the stronger the current shock effect, that is, the greater the nonlinear load change of the mobile phone fast charging adapter, the greater the electromagnetic interference intensity generated; on the contrary, the larger the value of the current difference index, the weaker the current shock effect, that is, the smaller the nonlinear load change of the mobile phone fast charging adapter, the smaller the electromagnetic interference intensity generated.

[0033] Step S3: determining a first current variation coefficient of the current signal according to the discreteness of all current values ​​of the current signal in each charging stage and the current difference index.

[0034] Modern smartphones generally use lithium batteries as power sources, and the characteristics of lithium batteries determine that their charging process is usually divided into three key stages: pre-charging stage, constant current charging stage and constant voltage charging stage.

[0035] Pre-charging stage: When the phone runs out of power, the charger first charges the lithium battery at a low constant current. The purpose of this stage is to gently activate the battery, gradually restore its chemical activity, and prepare for subsequent fast charging.

[0036] Constant current charging stage: After the battery activity is restored, the charger will gradually increase the voltage and charge at a constant optimal charging current. This stage is the main part of the lithium battery charging process, during which the battery obtains fast and efficient energy replenishment.

[0037] Constant voltage charging stage: When the battery power is close to 80%, the charger will switch to constant voltage mode, and the current input will gradually decrease. This is because as the battery power increases, the required charging current also decreases. When the current drops below the set critical value, the charger considers the battery to be close to full, and the phone will display that the battery is fully charged.

[0038] In different charging stages, the load of the mobile phone fast charging adapter is different, resulting in different speeds of current change. In order to eliminate the influence of the speed of current change in different charging stages on the electromagnetic interference phenomenon, the first current change coefficient of the current signal is determined based on the discrete degree of all current values ​​of the current signal in each charging stage and the current difference index, so as to more accurately evaluate and describe the influence of load change on the electromagnetic interference intensity during the charging process, thereby filtering out the influence of electromagnetic interference caused by load change on the mobile phone fast charging adapter test, specifically: Analyze the discreteness of all current values ​​of the current signal in each charging stage; It should be noted that there are many methods for measuring the degree of discreteness. In this embodiment, the standard deviation calculation method is used to measure the degree of discreteness of all current values ​​of the current signal in each charging stage. The implementer may also use other methods such as variance to measure the degree of discreteness, and this embodiment does not impose any special restrictions.

[0039] Further, the mean of the discreteness of all charging stages of the current signal is analyzed and recorded as the first mean of the current signal; The first current variation coefficient of the current signal is a result of fusing the current difference index of the current signal with the first mean value.

[0040] The mean of the discreteness of all current values ​​of the current signal in each charging stage represents the current fluctuation during the entire charging process. The first current variation coefficient characterizes the magnitude of the current change caused by the nonlinear load change during the charging process. The larger the value of the first current variation coefficient, the greater the current variation, so the greater the electromagnetic interference caused by the current change; conversely, the smaller the first current variation coefficient, the smoother the current fluctuation and the smaller the electromagnetic interference intensity.

[0041] Step S4: determining a second current variation coefficient of the current signal based on the variation of all current values ​​of the current signal in each charging stage.

[0042] In addition to interference from external conditions, the internal components of the mobile phone fast charging adapter can also cause electromagnetic interference. The switching element is an important component of the mobile phone fast charging adapter. Its core function is to control the flow of current by quickly opening and closing, thereby generating the required current level at the output end. It usually appears in the form of transistors, MOSFETs or other types of semiconductor switching devices.

[0043] The electromagnetic interference caused by the switching element can be determined by the current change rate at different charging stages combined with the switching frequency of the switching element. During the constant current charging stage, the mobile phone fast charging adapter provides a constant current to the mobile phone until the battery is close to full charge. At this time, the current remains basically unchanged, but the voltage gradually increases to close to the full charge voltage of the battery. Therefore, the electromagnetic interference caused by the constant current charging stage can be ignored.

[0044] During the pre-charging stage and the constant current charging stage, the fluctuation of the current signal is larger than that in the constant current charging stage. Therefore, the second current variation coefficient is calculated based on the current change rate in the pre-charging stage and the constant voltage charging stage to accurately quantify the electromagnetic interference caused by the internal switching elements of the mobile phone fast charging adapter in the pre-charging stage and the constant voltage charging stage, thereby filtering out the impact of the electromagnetic interference caused by the internal components of the mobile phone fast charging adapter on the mobile phone fast charging adapter test.

[0045] The expression of the second current variation coefficient of the current signal is: ; The second current variation coefficient of the current signal; the entire charging process includes pre-charging, constant current charging and constant voltage charging stages, , They represent the current change rate in the pre-charging stage and the current change rate in the constant voltage charging stage respectively; Indicates the switching frequency of the mobile phone fast charging adapter.

[0046] It should be noted that the value of the switching frequency is set artificially. The switching frequency of the mobile phone fast charging adapter is generally between tens of kilohertz and several megahertz. In this embodiment, the switching frequency of the mobile phone fast charging adapter is 50kHz. The implementer can also set it according to the specific situation. This embodiment does not impose any special restrictions.

[0047] The second current variation coefficient characterizes the magnitude of the electromagnetic interference caused by the switching elements inside the mobile phone fast charging adapter. The larger the value of the second current variation coefficient, the greater the electromagnetic interference caused during the pre-charging stage and the constant-voltage charging stage of fast charging, and the stronger the interference to the current signal; conversely, the smaller the value of the second current variation coefficient, the smaller the electromagnetic interference caused during the pre-charging stage and the constant-voltage charging stage of fast charging, and the weaker the interference to the current signal.

[0048] Step S5: determining an adaptive cutoff frequency of the current signal based on the frequency distribution of the current signal and in combination with the first current variation coefficient and the second current variation coefficient.

[0049] In order to eliminate the influence of electromagnetic interference, this embodiment uses a low-pass filter to filter out the high frequency of the current signal. In this process, selecting a suitable cut-off frequency is the key to filtering out noise. The lower the cut-off frequency, the stronger the filter's ability to suppress high-frequency noise, but it may also cause the high-frequency components of the useful signal to be filtered out; the higher the cut-off frequency, the weaker the filter's ability to suppress high-frequency noise, but it can retain more high-frequency components of the signal.

[0050] When selecting the cutoff frequency, it is necessary to balance the filtering effect and signal quality. A cutoff frequency that is too low may filter out useful signal components, while a cutoff frequency that is too high may not effectively filter out interference. Therefore, based on the frequency distribution of the current signal, combined with the first current variation coefficient and the second current variation coefficient, the adaptive cutoff frequency of the current signal is determined to ensure that electromagnetic interference is effectively suppressed and the signal quality is not greatly affected, specifically: The current signal collected during the charging process of the mobile phone fast charging adapter is subjected to Fourier transform to convert the current signal from a time domain signal to a frequency domain signal.

[0051] The current value after the third quartile of all current values ​​of the current signal arranged from small to large is considered to be an interference component, and the frequency corresponding to the minimum current value after the third quartile is recorded as the starting frequency of the current signal.

[0052] Further, a normalized result of the sum of the first current variation coefficient and the second current variation coefficient of the current signal is analyzed and recorded as an adjustment factor of the current signal; The adaptive cut-off frequency of the current signal is the product of the starting frequency of the current signal and the adjustment factor.

[0053] The larger the values ​​of the first current variation coefficient and the second current variation coefficient, the greater the impact of electromagnetic interference on the internal components of the mobile phone fast charging adapter, and the larger the value of the adjustment factor, the more it is necessary to increase the cutoff frequency of the low-pass filter to filter out the high-frequency noise of electromagnetic interference; conversely, the smaller the values ​​of the first current variation coefficient and the second current variation coefficient, the smaller the electromagnetic interference, and the cutoff frequency of the low-pass filter can be appropriately adjusted to filter out the high-frequency noise of electromagnetic interference.

[0054] Preferably, the schematic diagram of the adaptive cutoff frequency extraction process provided by the present application is as follows: Figure 2 shown.

[0055] Step S6: Based on the current signal and its adaptive cutoff frequency, the output current of the mobile phone fast charging adapter is detected.

[0056] The adaptive cutoff frequency of the current signal is used as the parameter of the low-pass filter. The low-pass filter with set parameters is used to remove the high-frequency noise of the current signal during the charging process of the mobile phone fast charging adapter. The end of the low-pass filter is selected as the 4th order to provide sufficient attenuation rate while maintaining the response speed of the filter.

[0057] It should be noted that in this embodiment, the end of the low-pass filter is selected to be 4th order. The implementer can also select a low-pass filter of corresponding order according to the specific situation and in combination with the performance and feasibility of the filter. This embodiment does not impose any special restrictions.

[0058] After filtering, the current signal with electromagnetic interference eliminated is obtained. The current signal is analyzed to determine whether the output current of the mobile phone fast charging adapter is qualified. Specifically: If the average of all current values ​​of the current signal for eliminating electromagnetic interference in the constant current charging stage is within a preset range, the output current of the mobile phone fast charging adapter to be tested is qualified; otherwise, the output current of the mobile phone fast charging adapter is unqualified.

[0059] It should be noted that the value of the preset range is artificially specified, and the fluctuation range of the output current of a qualified mobile phone fast charging adapter is very small, so the value of the preset range in this embodiment is the value of the mobile phone fast charging adapter. The implementer can also set it according to the specific situation, and this embodiment does not make any special limitation.

[0060] At this point, based on the adaptive cutoff frequency of the current signal, a low-pass filter is used to remove the high-frequency noise in the current signal, eliminate the influence of electromagnetic interference, and complete the detection of the output current of the mobile phone fast charging adapter charger.

[0061] Preferably, the schematic diagram of the output current detection process of the mobile phone fast charging adapter provided in the present application is as follows Figure 3 shown.

[0062] Based on the same inventive concept as the above method, an embodiment of the present application also provides a quick testing device for a mobile phone fast charging adapter, including a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps of any one of the above-mentioned methods for quick testing a mobile phone fast charging adapter are implemented.

[0063] It should be noted that the above sequence of the embodiments of the present application is for description only and does not represent the advantages and disadvantages of the embodiments. The above is a description of a specific embodiment of this specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0064] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0065] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application should be included in the protection scope of the present application.

Claims

1. A quick test method for a mobile phone fast charging adapter, characterized in that: The method comprises the following steps: Collect the current signal of the mobile phone fast charging adapter during the overall charging process within the sampling time, wherein the overall charging process includes multiple charging stages; Determine a first current variation coefficient of the current signal according to the difference between all current values ​​in the current signal and their average distribution, combined with the degree of dispersion of all current values ​​of the current signal in each charging stage; Determining a second current variation coefficient of the current signal based on the variation of all current values ​​of the current signal in each charging stage; Based on the distribution of all frequencies of the current signal in the frequency domain, the adaptive cutoff frequency of the current signal is determined in combination with the first current change coefficient and the second current change coefficient to detect the output current of the mobile phone fast charging adapter.

2. A quick test method for a mobile phone fast charging adapter as claimed in claim 1, characterized in that: The method for determining the first current variation coefficient of the current signal is: Determine a current difference index of the current signal according to the difference between all current values ​​in the current signal and their average distribution; Analyze the mean of the discrete degrees of the current signal in all charging stages, and record it as the first mean of the current signal; A first current variation coefficient of the current signal is determined based on the first mean value and the current difference index.

3. A quick test method for a mobile phone fast charging adapter as claimed in claim 2, characterized in that: The method for determining the current difference index of the current signal is: Each current value in the current signal that is greater than the current value at the adjacent sampling moments before and after is recorded as the impact peak value of the current signal; Based on the difference between all impact peak values ​​of the current signal in each charging stage and the average distribution of all current values ​​in the corresponding charging stage, a current difference index of the current signal is determined.

4. A quick test method for a mobile phone fast charging adapter as claimed in claim 3, characterized in that: The determining of the current difference index of the current signal based on the difference between all impact peak values ​​of the current signal in each charging stage and the average distribution of all current values ​​in the corresponding charging stage further includes: Analyze the cumulative difference between all impact peak values ​​of the current signal in each charging stage and the average value of all current values ​​in the charging stage, and record it as the first current index of the current signal in each charging stage; The current difference index of the current signal is a result of integrating the first current indexes of the current signal in all charging stages.

5. A quick test method for a mobile phone fast charging adapter as claimed in claim 2, characterized in that: The first current variation coefficient of the current signal is a product of a first mean value of the current signal and a current difference index.

6. A quick test method for a mobile phone fast charging adapter as claimed in claim 1, characterized in that: The expression of the second current variation coefficient of the current signal is: ; The second current variation coefficient of the current signal; the entire charging process includes pre-charging, constant current charging and constant voltage charging stages, , They represent the current change rate in the pre-charging stage and the current change rate in the constant voltage charging stage respectively; Indicates the switching frequency of the mobile phone fast charging adapter.

7. A quick test method for a mobile phone fast charging adapter as claimed in claim 1, characterized in that: The method for determining the adaptive cut-off frequency of the current signal is: Analyze the normalized result of the sum of the first current variation coefficient and the second current variation coefficient of the current signal, and record it as the adjustment factor of the current signal; The frequency corresponding to the minimum current value after the third quartile of all current values ​​of the current signal sorted from small to large is recorded as the starting frequency of the current signal; An adaptive cutoff frequency of the current signal is determined based on the start frequency of the current signal and the adjustment factor.

8. A quick test method for a mobile phone fast charging adapter as claimed in claim 7, characterized in that: The adaptive cut-off frequency of the current signal is the product of the starting frequency of the current signal and the adjustment factor.

9. A quick test method for a mobile phone fast charging adapter as claimed in claim 6, characterized in that: The detecting of the output current of the mobile phone fast charging adapter includes: The current signal and its adaptive cut-off frequency are used as the input of the low-pass filter, and the current signal with electromagnetic interference eliminated is output; If the average value of all current values ​​of the current signal for eliminating electromagnetic interference in the constant current charging stage is within a preset range, the output current of the mobile phone fast charging adapter to be tested is qualified, otherwise it is unqualified.

10. A fast testing device for a mobile phone fast charging adapter, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of a quick testing method for a mobile phone fast charging adapter as described in any one of claims 1-9 are implemented.

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